我有一个项目需要为两点之间的路线提供多种颜色。我使用Google maps API来使代码正常工作。这是我正在处理的代码。
HTML部分：
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="initial-scale=1.0, user-scalable=no">
<meta charset="utf-8">
<style type="text/css">
html { height: 100% }
body { height: 100%; margin: 0; padding: 0 }
#map-canvas { height: 100% }
</style>
<title>Waypoints in directions</title>
<script src="https://maps.googleapis.com/maps/api/js?v=3.exp&sensor=false"></script> </head>
<body>
<div id="map-canvas" style="float:left;width:70%;height:100%;"></div>
<div id="control_panel" style="float:right;width:30%;text-align:left;padding-top:20px">
<div style="margin:20px;border-width:2px;">
<div id="panel">
<b>Start: </b>
<input id="start" type="text" onchange="calcRoute();">
<br>
<b>End: </b>
<input id="end" type="text" onchange="calcRoute();">
</div>
<br>
<b>Waypoints:</b> <br>
<p><input type="button" value="waypoint" onclick="waypoint();" width="100px" height="60px"></p>
</div>
<div id="div"></div>
<p><input type="button" value="submit" onclick="calcRoute();" width="100px" height="60px"></p>
</div>
</body>
</html>
JavaScript部分：
function initialize() {
directionsDisplay = new google.maps.DirectionsRenderer({
polylineOptions: {
strokeColor: "blue"
}
});
directionsDisplay1 = new google.maps.DirectionsRenderer({
suppressMarkers: true,
polylineOptions: {
strokeColor: "green"
}
});
directionsDisplay2 = new google.maps.DirectionsRenderer({
suppressMarkers: true,
polylineOptions: {
strokeColor: "orange"
}
});
directionsDisplay3 = new google.maps.DirectionsRenderer({
suppressMarkers: true,
polylineOptions: {
strokeColor: "red"
}
});
var chicago = new google.maps.LatLng(41.850033, -87.6500523);
var mapOptions = {
zoom: 14,
mapTypeId: google.maps.MapTypeId.ROADMAP,
center: chicago
}
map = new google.maps.Map(document.getElementById('map-canvas'), mapOptions);
directionsDisplay.setMap(map);
directionsDisplay1.setMap(map);
directionsDisplay2.setMap(map);
directionsDisplay3.setMap(map);
}
function calcRoute() {
start = document.getElementById('start').value;
end = document.getElementById('end').value;
for (var i = 0; i < counter; i++) {
checkpts[i] = document.getElementsByClassName('way')[i];
waypoints.push({
location:checkpts[i].value,
stopover:true});
}
var request = {
origin: start,
destination: end,
waypoints: waypoints,
optimizeWaypoints: true,
travelMode: google.maps.TravelMode.DRIVING
};
directionsService.route(request, function(response, status,routes) {
if (status == google.maps.DirectionsStatus.OK) {
directionsDisplay.setDirections(response);
myRoute = response.routes[0];
}
for (var i=0; i<myRoute.legs[0].steps.length; i++) {
pts[i]=myRoute.legs[0].steps[i].polyline.points;
points[i]=String(pts[i]);
waypts[i]=decode(points[i]);
Points.push(waypts[i]);
}
for (var i=0; i<myRoute.legs[0].steps.length; i++){
for (var j=0; j<Points[i].length; j++){
routepts.push(Points[i][j]);
}
}
var s=routepts.length;
var k=(s/4);
for(var i=1;i<=4;i++)
{
latlng[i-1] = new google.maps.LatLng(routepts[(parseInt(i*k)-1)][0], routepts[(parseInt(i*k)-1)][1]);
}
var geocoder = new google.maps.Geocoder();
geocoder.geocode({'latLng': latlng[0]},function(results, status) {
if (status == google.maps.GeocoderStatus.OK) {
if (results[1]) {
address.push(results[1].formatted_address);
}
}
});
geocoder.geocode({'latLng': latlng[1]},function(results, status) {
if (status == google.maps.GeocoderStatus.OK) {
if (results[1]) {
address.push(results[1].formatted_address);
}
}
});
geocoder.geocode({'latLng': latlng[2]},function(results, status) {
if (status == google.maps.GeocoderStatus.OK) {
if (results[1]) {
address.push(results[1].formatted_address);
}
}
});
geocoder.geocode({'latLng': latlng[3]}, function(results, status) {
if (status == google.maps.GeocoderStatus.OK) {
if (results[1]) {
address.push(results[1].formatted_address);
}
}
});
})
var request1 = {
origin: start,
destination: String(address[1]),
waypoints: waypoints,
optimizeWaypoints: true,
travelMode: google.maps.TravelMode.DRIVING
};
directionsService.route(request1, function(response, status,routes) {
if (status == google.maps.DirectionsStatus.OK) {
directionsDisplay1.setDirections(response);
}
})
var request2 = {
origin: String(address[1]),
destination: String(address[2]),
waypoints: waypoints,
optimizeWaypoints: true,
travelMode: google.maps.TravelMode.DRIVING
};
directionsService.route(request2, function(response, status,routes) {
if (status == google.maps.DirectionsStatus.OK) {
directionsDisplay2.setDirections(response);
}
})
var request3 = {
origin: String(address[2]),
destination: end,
waypoints: waypoints,
optimizeWaypoints: true,
travelMode: google.maps.TravelMode.DRIVING
};
directionsService.route(request3, function(response, status,routes) {
if (status == google.maps.DirectionsStatus.OK) {
directionsDisplay3.setDirections(response);
}
})
}
function decode(instring) {
var out=[];
//instring = instring.replace(/\\\\/g, "\\");
out = decodeLine(instring);
return out;
}
function decodeLine(encoded) {
var len = encoded.length;
var index = 0;
var array = [];
var lat = 0;
var lng = 0;
while (index < len) {
var b;
var shift = 0;
var result = 0;
do {
b = encoded.charCodeAt(index++) - 63;
result |= (b & 0x1f) << shift;
shift += 5;
} while (b >= 0x20);
var dlat = ((result & 1) ? ~(result >> 1) : (result >> 1));
lat += dlat;
shift = 0;
result = 0;
do {
b = encoded.charCodeAt(index++) - 63;
result |= (b & 0x1f) << shift;
shift += 5;
} while (b >= 0x20);
var dlng = ((result & 1) ? ~(result >> 1) : (result >> 1));
lng += dlng;
array.push([lat * 1e-5, lng * 1e-5]);
}
return array;
}
function waypoint(){
var d=document.getElementById("div");
d.innerHTML+="<p><input type='text' placeholder='waypoint' class='way'>";
counter++;
}
google.maps.event.addDomListener(window, 'load', initialize);
运行代码时，出现错误。
我是Google Maps API的新用户。请提供一些帮助我的建议 提前谢谢。